12-16-2013 01:44 PM - edited 03-07-2019 05:06 PM
Hi,
I recently installed a 3750 switch and cannot telnet to it from any workstation. However, I can telnet to the new 3750 from another 3750 switch stack.
My workstation can ping the switch and the switch can ping my workstation. Same holds through for another workstation I tested from. I've telneted to the new switch from every switch on the way back to my workstation, all can telnet to the switch successfully. Traceroute from my workstation to and from the new switch also works.
Any idea what I might be missing? Here is the VTY configuration:
line vty 0 4
password 7 password
logging synchronous
login
transport input telnet ssh
line vty 5 15
password 7 password
logging synchronous
login
transport input telnet ssh
vlan config:
interface Vlan1
ip address 10.15.127.75 255.255.128.0
ip helper-address 10.15.127.2
!
ip default-gateway 10.15.127.254
I started with 15.02 SE5, but have since backed off to SE2 - no change there either.
Solved! Go to Solution.
12-16-2013 06:17 PM
Do you accidently have ip routing turned on ? If ip routing is on then the ip default gateway commmand will not work and you would need a default static route pointing to 10.15.127.254 . Also verify you masking matches. That's a very big subnet mask .
12-16-2013 02:18 PM
Where is the routing for this subnet done ? Is vlan 1 allowed or configured on the uplink ? Can you post both ends of the connecting link ?
12-16-2013 02:23 PM
Hi Glen,
Switch side:
interface GigabitEthernet1/0/23
description Core
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1
switchport mode trunk
channel-group 1 mode on
!
interface GigabitEthernet1/0/24
description Core
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1
switchport mode trunk
channel-group 1 mode on
Core Side:
int g1/47
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1
switchport mode trunk
channel-group 25 mode on
int g2/47
switchport
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1
switchport mode trunk
channel-group 25 mode on
There isn't much to it and this exact same implementation is being used on 100+ switch stacks.
12-16-2013 06:17 PM
Do you accidently have ip routing turned on ? If ip routing is on then the ip default gateway commmand will not work and you would need a default static route pointing to 10.15.127.254 . Also verify you masking matches. That's a very big subnet mask .
12-17-2013 08:08 AM
Thank you, this led me in the right direction. The switch is running OSPF. In my configuration of passive-interfaces I forgot to exclude the interface vlan1. Once I added that as an exclusion, I was able to telnet to the switch.
12-16-2013 10:51 PM
Hi Danial,
Can u please add login local to ur vty line.
line vty 0 4
password 7 password
logging synchronous
login local
transport input telnet ssh
line vty 5 15
password 7 password
logging synchronous
login local
transport input telnet ssh
Regards
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